I'm attempting to recover a 7 Drive RAID6 array from a failed Thecus NAS. I've been able to get the drives and access to the data through an Ubuntu machine I setup, the problem being that the transfer rates off of the raid are painfully slow (~500Kb/s - 1.2Mbs/).
I've discovered that one of the drives appears to be degraded, and am guessing that is probably the root of the problem. When performing a "mdadm --detail /dev/md0" I get the following results:
/dev/md0: Version : 1.2 Creation Time : Tue May 7 15:39:33 2013 Raid Level : raid6 Array Size : 14638110720 (13959.99 GiB 14989.43 GB) Used Dev Size : 2927622144 (2792.00 GiB 2997.89 GB) Raid Devices : 7 Total Devices : 6 Persistence : Superblock is persistent Update Time : Thu Feb 8 08:02:27 2018 State : clean, degraded Active Devices : 6 Working Devices : 6 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 64K Name : N7700PRO:0 UUID : 7169575c:a8d508eb:dea20994:ee2351ef Events : 64278 Number Major Minor RaidDevice State 7 8 130 0 active sync /dev/sdi2 2 0 0 2 removed 2 8 82 2 active sync /dev/sdf2 3 8 34 3 active sync /dev/sdc2 4 8 50 4 active sync /dev/sdd2 5 8 2 5 active sync /dev/sda2 6 8 18 6 active sync /dev/sdb2
I've got a spare drive on-hand for a failed drive, but I'm not entirely sure how to add it into the array and repair it. I've pulled the bad drive out of the system, and plugged the spare in it's place, but when performing the mdadm --detail I'm getting the same results as with the original drive in place.
I believe the command to add a drive is just
mdadm --add /dev/md0 <new_disk>
But, I'm unsure how to get the path for the new disk since it isn't appearing in the list, I wasn't seeing any information in the disk utility that matches the "/dev/sdx2" format either to lend any clues for the command.
I've also got all of the SATA ports on the Motherboard occupied at this point, and am wondering if that could be part of the issue as well? I'm not really sure, but here are the details of the machine as it sits-
- 7x3TB WD REDS (RAID Drives)
- 1x2TB WD Green (OS)
- Asus Sabertooth 990fx r2
- 16GB DDR3
- AMD FX 8350
- AMD 7870
- XFX 850w PSU
ls /dev/sd?; some investigation says that it looks like the new drive is
/dev/sda /dev/sdc /dev/sde /dev/sdg /dev/sdi /dev/sdb /dev/sdd /dev/sdf /dev/sdh
mount | awk '$3=="/"'
/dev/sdh1 on / type ext4 (rw,relatime,errors=remount-ro,data=ordered)
Let me know if there is any further information you may need, appreciate any and all assistance in this.